Safety-tread.



CORPORATION OF MAlNE.

MAINE, ASSIGNOR] TO OF BOSTON, MASSALHUSEITS. 'A

SAFETY' EREAD.

Specification of Letters Patent.

Patented Dec. 11 ,---1 9G6.

..'mnlication filed October 19.1905- Serial No. 283.426.

To 11H whom, it may concern:

Be it known that I, Tnnogonn P. FARMER,

of Southwest Harbor, in the county of Hancock and State of Maine, haveinvented certain new'and useful Improvements in Safetyljreads, of,whichthe following is a specification. 4

This invention has relation to safety treads, and has for its object toprovide certain implrovements therein in consequence of which teflfrictional or antislippin material maynbe more securely lock d in thesockets in the base-plate.

Referring to the accompanying drawings, Figure 1 represents lan view aportion of a metallic safety-tree. in which the sockets or grooves arepartially filled with frictional or antislipping material. Fig. 2represents a longitudinal section on the line 2 2 of Fig. 1.

3 re resents a section on the line 3 3 of Fig. 1. 1g. 4 represents aperspective view of one end of the tread with one of the walls brokenaway to illustrate one of the lockington ues.

'I he tread consists of a metallicbase-plate provided with sockets forthe reception of the frictional or antislipping material, which mayconsist of lead or any other equivalent substance. Preferably thesockets are in the form of grooves or channels; but this is notessential, although I consider it preferable.

In the embodiment of the invention illustrated on the drawin s thebase-plate a is provided with a plurality of upstanding parallel ribs 5,which form a series of parallel sockets extending longitudinally of theplate.

The plate itself may be hot-rolled-or may be'past, being preferably madeof ferruginous material. Each of the channels may be filled withfrictional material; but in most cases I find it sufficient to fill thealternating chanf nels or sockets.

For the purpose of securing or looking the frictional material in the.sockets each is provided with one or more tongues, as at 0. Where theplate is made of hot-rolled steel,

thesetongues may be formed by punching Ihave illustrated the ton themfrom the base; but where the plate is cast these tongues may be castintegrally with the plate.

In the embodiment of the invention which es are punched and died intothe form an into the relative and below the lo tongues and securedtheremby said tonguespositions, as illustrated, the tongues all extending inthe same direction longitudinally 5 5 of the channels or sockets. Eachtongue 1s curved longitudinally and transversefv,"' so that it is she edsomewhat like the bowl of a spoon, with t e convex surface uppermost.

The lead or other antislipping material may be placed in the channels orsockets either when in a molten state (in which case it is to bepouredin) or-maybe ressed thereinto from a sheet or strip. consider itmore desirable to draw the leadin sheets or 6 strips from'a reel and tocrowd it into the grooves or channels by means of a roller or othersuitable presser, so as to'crowol the ma- 'terial underneath thetongues, as shown I find that a safety-tread possessing the featuresthus described is simple in construction and cheap to manufacture. Theanti-- slipping material is securely held and locked against removal,either aocidentalor inten 7'; tional. In the articular embodimentillustrated the antisi ping material fills the aper tures (1, left by te formation of the tongues, and thus serves to still further insureagainst the removal of the antislip ing material. .80

Having thus explained t enature of the invention and described a way ofconstructing and using the same, although withoutatk tempting to setforth all of the: forms in which it may be made or all of the modes of85' its use, I declare that what I claim is 1. A safety-tread comprisinga base-platea havin one or more sockets, said plate being} rovi ed withlockin -ton es extending ongitudinally into sai soc rats and termi 9Lnating below the tbp thereof, and antislip'e ping material located in'said sockets above; itudinal portions hi the;

2. A safety tread comprising a base pla'te w; having apluralitywofchannels, anday-series of concave-convex" tongues projectininto said channels and-extending lo'ngitu ally thereof and-belowthe'upper ortread surface, g and antislipping material located in saidIcochannels above and below the lon itudinal portions of the tongues andlocked therein y said tongues. .4;

3. A safetytread comprising a baselate having a plurality of upstandingwalls or'mr05. ing sockets, and a plurality of tongues pro In testimonywhereof I have aflixed my signature in presence of two witnesses.

THEODORE FARMER.

jeeting from said plate upwardly and longitu- (finally into saidsockets, and :mtislipping; materiellocated in said sockets above and 1below the longitudinal portions of the tongues and held therein bysaidtongues,sai(l tongues Witnesses: terminating below the upper surfzweiofthe 3 JOHN E. WELSH, tread. (J. (J. STEcuER.

